replace String concatenation in SPARQL query building with StringBuilder
and use variable binding
modify SPARQL query in SesameManager.getCurrentVersionInternal() to
work when the input is an older version IRI.
add fixme note in SesameManager.getAllOntologyVersions()
implement SchemaManager.getCurrentSchemaOntologyVersion()
add podd-plant ontology version 2 for tests
remove debug statements
add new method SchemaManager.getSchemaOntologyVersion() to API
add new method SesameManager.getSchemaVersion() to API
add ignored test methods for new API methods